使用共价探针对癌症酶活动的CT成像显示了尺寸依赖的模式
Darya Tsvirkun1, Yael Ben-Nun1, Emmanuelle Merquiol1
1The Institute for Drug Research, The School of Pharmacy, The Faculty of Medicine, Campus Ein Karem , The Hebrew University , Jerusalem 9112001 , Israel.
这项研究引入了基于金纳米粒子活动的新型探针 (GNP-ABPs),用于使用计算机断层扫描 (CT) 增强癌症成像. 这些探针能够对瘤中的酶活性进行敏感检测,从而提升功能CT成像能力.
科学领域:
- 生物医学成像
- 纳米技术
- 分子成像
背景情况:
- 计算机断层扫描 (CT) 是一种广泛使用且具有成本效益的医学成像方法.
- 电脑扫描分子成像是一种新兴领域,利用黄金纳米粒子 (GNP) 和含的化合物等对比剂.
- 由于扫描器对对比试剂的敏感性较低,用CT检测酶活性具有挑战性.
研究的目的:
- 为癌症功能性CT成像开发新的纳米尺寸cathepsin向活动型探针 (ABPs).
- 通过CT建立生物过程 (酶活性) 和成像信号之间的直接联系.
- 在癌症组织中检测高素活性的新型探针.
主要方法:
- 用GNP标记的ABP库的生成和生物化学评估.
- 系统变化GNP大小,目标分量比率和聚乙烯糖醇 (PEG) 保护层.
- 优化GNP-ABP用于小鼠的非侵入性癌症成像和瘤截面的传输电子显微镜 (TEM) 分析.
主要成果:
- 开发和评估CT成像的新型GNP-ABP.
- 观察到CT对比检测和GNP大小/目标部分数量之间的反向相关性.
- TEM成像显示了瘤组织内GNP- ABPs的细胞间溶解体局部化.
结论:
- ABP与GNP的共价连接对于CT等低灵敏度成像方式的检测至关重要.
- 在基于酶的功能性CT成像中,GNP-ABP是一个有前途的工具.
- 证明了GNP- ABP在体内非侵入性检测酶活性的实用性.
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